On the issue of amplifier power, I've heard the c4's on a 90 watt tube amp and a 350 watt SS amplifier. No contest, the higher powered solid state amplifier delivered superior bass, control and dynamics and sounded better and more detailed on lower volume.
On the other hand the sound of the c4's on the 90 watt amplifier was on the beautiful, musical and languid side with wonderful imaging and timbre but could sound lifeless on some material that I know has a little punch to it.
I think both odokme and rower man make valid points but both are not right with the other being wrong.
Over time, some stridency has left the higher powered amp in the upper volumes, Im quite happy with my switch to the stronger dynamics of solid state but there are times I miss the more beautiful sound of a tube amp.
Maybe I would be happiest with a 200 watt tube amp.